Tam Lin is a demon of the Yousei Clan and has a set level of 55. He's encountered early on in the final dungeon, where his respective palette swap (with a complimentary skillset), Cu Chulainn, is also frequently encountered.
Tam Lin is a Persona of the Sun Arcana in Persona 4, and remains the only palette-swapped Persona remaining in the series. His fusion prerequisite requires the protagonist to perform a cross-spread fusion using, Gdon,Phoenix,Narasimha, and Yatagarasu in the Velvet Room.
He starts out at level 53.